The Correct Answer is Magnetic Force.

• Magnetic resonance imaging ( MRI) is one of the most popular medical imaging methods used in the world at many diagnostic centers.
• These MRI scanners use strong magnetic fields, gradients of the magnetic field, and radio waves to produce images of the organs inside the body.
• The magnetic force is a component of the electromagnetic force, one of nature's four basic forces, which is induced by charge movement.
• There would be a magnetic force of attraction between two objects containing charge in the same direction of motion, while objects in charge traveling in opposite directions have between them a repulsive force.

The correct answer is CPU.

Key Points

• CPU (Central Processing Unit) -
  • It is the main part of the computer, it can also be called the 'brain of the computer'.
  • Its function is to process the inputs and instructions coming on the computer. 
  • This unit of computer performs arithmetic, logical, control functions, input functions, and output functions. 
  • It is also commonly known as a processor.

Additional Information

• Motherboard -
  • It is a printed circuit board installed in most electronic plants such as laptops, computers, etc.
  • It is also called the mainboard or system board.
  • The main part of the motherboard is its chipset.
• RAM (Random Access Memory) -
  • This is a type of memory, we also know it by the name of Primary Memory.
  • There are two types of RAM. Static RAM and Dynamic RAM

The correct option is 1).

Explanation:-

Keys are used in RDBMS:- 

Primary key:- Every relation has at least one candidate key because at least the combination of all its attributes has a unique property. Such type of candidate key which is chosen as a primary key for the table is known as the primary key. Primary keys are used to identify tables.

Foreign key:- A foreign key is a field or group of fields in a database record that points to a key field or group of fields forming a key of another database record in some table. Usually, a foreign key in one table refers to the primary key of another table.

Unique key:- A unique key is a super key that is, in the relational model of database organization, a set of attributes of a relation variable for which it holds that in all relations assign to that variable.

The correct answer is "option 1".

CONCEPT:

Inheritance is a mechanism of acquiring the features & behaviors of parent class by child class.

The class that inherits the properties is called the derived class.

The class of which the derived class inherits the properties is called the base class.

EXPLANATION:

Option 1: 

Parallel Inheritance is not a type of inheritance in C++.

Option 2:

In Single inheritance, a single derived class can inherit properties of the single base class.

Option 3:

Multilevel Inheritance is used to create more than one generation of classes.

Option 4:

In Multiple Inheritance, there can be more than one base class with one derived class.

Hence, the correct answer is "option1".

The correct answer is Rowing​.

• Olympian Arjun Lal Jat of Rajasthan is associated with rowing.

Key Points

• Arjun Lal Jat:
  • He is associated with the men's lightweight double sculls event of rowing.
  • He is from the Jaipur district of Rajasthan.
  • He partnered with Arvind Singh for the event

Additional Information

• Tokyo Olympics:
  • It is officially called the Games of the XXXII Olympiad.
  • The host city is Tokyo, Japan.
  • Tokyo became the first city in Asia to hold the Summer Games twice.
  • The new Olympic motto now reads in Latin “Citius, Altius, Fortius - Communiter” and “Faster, Higher, Stronger - Together” in English.
• Olympics:
  • Athens was the venue for the first Olympics which was held in 1896.
  • Since then Games are held every four years.
  • The Olympic flag was created in 1913 at the suggestion of Baron Pierre de Coubertin.
  • In the Amsterdam Games in 1928, an Olympic flame was ceremonially lighted and burned in a giant torch at the entrance of the stadium. 

Calculation:

The difference between the number of employees of Department E and Department C

⇒ 300 - 50 (taking the positive difference only)

⇒ 250

∴ The difference between the number of employees of Department E and Department C is 250.